Window screens are the part of the window most homeowners notice last and replace least. They tear, sag, discolour, and develop pinholes that let in the entire mosquito population of the GTA, and most people live with the damage for years before doing anything about it. The fix is usually cheaper than people think often under $40 in parts for a DIY re-mesh but knowing what you actually have is the difference between a 30-minute project and a frustrating weekend. If your screens are part of a larger window problem, our window replacement service handles full screen rebuilds as part of the project, but for healthy windows you can almost always handle screens yourself.

This guide walks through how to diagnose what is wrong, how to decide between repair and replacement, what the different mesh and frame options actually do, and the right way to size a replacement if you go that route. By the end you will know exactly what your screens need.

Diagnose what is actually wrong

Pull the screen and lay it flat on a table. Run your hand across the mesh. There are six common failures: torn mesh, sagging or stretched mesh, pinholes from age and UV, a bent or twisted aluminum frame, a dried-out spline (the rubber cord that holds the mesh in the frame channel), or broken corner clips. The first three are mesh problems and the screen can be re-meshed. The last three are frame problems and the whole screen may need to be rebuilt or replaced.

Take a photo of the screen and note the dimensions of the frame opening to the nearest millimetre. You will need this information whether you DIY or order a replacement.

When a re-mesh is the right call

If the aluminum frame is straight, the corner clips are intact, and the spline channel is clean, a re-mesh is the right answer. Cost in parts: $15 to $30 per screen. Tools needed: a spline roller (about $8) and a utility knife. Time: 20 to 30 minutes per screen for a first-timer, 10 minutes once you have done a few. The result is indistinguishable from a brand-new screen.

Pry out the old spline with an awl or flat-head screwdriver, lift out the old mesh, lay the new mesh over the frame with about 25 mm of overhang on each side, press the new spline into the channel with the roller working from one corner around, and trim the excess mesh with the utility knife held flat against the spline. Three things matter: do not stretch the mesh as you go (let the spline pull it tight), keep the corners square, and use a spline diameter that matches the channel.

When the whole screen has to go

If the frame is bent or twisted, the corner clips are broken, or the spline channel itself is damaged, you have a frame problem. You can buy replacement aluminum frame stock, mitre it, install new corner clips, and rebuild the screen but for a single screen, by the time you have bought the frame stock and the corner clips and the mesh and the spline, you are within $10 of a new pre-built screen from your window manufacturer. Order the replacement and re-do the time you would have spent on the rebuild.

If your window is from a major GTA brand (Vinyltek, North Star, Centennial, Gentek, Strassburger, Pollard, Energy Brand, ALDA), the manufacturer will sell you a pre-built replacement screen sized to your window if you give them the window serial number from the spacer between the panes. Lead time is usually 1 to 2 weeks and the cost is typically $45 to $90 per screen.

Mesh types and when to use them

Standard fibreglass mesh (the grey or charcoal mesh on most windows) is the default. It is cheap, soft, easy to work with, and lasts about 8 to 12 years in the GTA before UV breaks it down. Buy charcoal grey rather than silver it is much easier to see through.

Aluminum mesh is more durable but tougher to work with and shows dents and creases permanently. Use it for screens that take physical contact, basement windows that get bumped by lawn equipment, or any screen at child-height that is regularly pushed.

Pet-resistant mesh is a heavy-duty vinyl-coated polyester about seven times stronger than standard fibreglass. Worth the upgrade ($30 to $50 in mesh per screen) for any household with cats or dogs that lean on screens.

No-see-um mesh is woven much tighter than standard mesh and stops blackflies and the smallest biting insects in addition to mosquitoes. Worth specifying for cottages and for properties near ravines or wet areas in the GTA. The trade-off is reduced airflow.

Solar mesh blocks 70 to 90 percent of UV and significantly reduces summer cooling load on south- and west-facing windows. The exterior view is dimmer but the interior view is unaffected. A solid choice for west-facing rooms that overheat in July and August.

Retractable and magnetic screens

Retractable screens roll up into a discreet housing along the top or side of the window or door when not in use. They are ideal for casement windows where the screen sits inside the room (because the sash swings out) and for patio doors where a fixed screen would block the view all winter. Cost installed: $250 to $500 per opening for a window, $400 to $800 for a patio door. They need professional installation but the durability is excellent.

Magnetic screens are a budget option for screen doors only two halves of mesh held together by a strip of magnets in the middle. They cost $25 to $50, install with adhesive strips, and last one to three seasons. Fine for a rental or a temporary fix. Not a long-term solution.

How to size a replacement screen

Measure the screen frame opening (not the screen itself) at three points horizontally and three points vertically. Use the smallest number in each direction. Subtract 3 mm from each dimension to allow for clearance and frame tolerance.

When ordering from a manufacturer, also note: the screen colour (almond, white, brown, black), the channel side (interior or exterior screen), the spline diameter (most are 0.155 inch or 4 mm), and any pull tabs or finger holes you want included. Send a photo of the existing screen with your order to avoid mismatches.

Frequently asked questions

How long do window screens last in Toronto?

Standard fibreglass mesh lasts 8 to 12 years in the GTA before UV makes it brittle and prone to tearing. Aluminum frames last much longer often 25 years or more, so most screen failures are mesh problems on a still-healthy frame, which is good news for the wallet.

Can I replace just the mesh on my window screen?

Yes, in most cases. If the aluminum frame is straight and the corner clips are intact, a re-mesh is a 20 to 30 minute DIY job using $15 to $30 in materials and a spline roller. Pry out the old spline, replace the mesh, roll in new spline, trim the excess.

What is the best mesh for a household with pets?

Pet-resistant vinyl-coated polyester mesh – about seven times stronger than standard fibreglass. It costs $30 to $50 in mesh per screen versus $5 to $10 for standard, and it survives cats and dogs that lean on screens. Worth the upgrade for any animal household.

Are retractable screens worth the extra cost?

Yes for casement windows where the screen would otherwise sit inside the room, and yes for patio doors where you want an unobstructed view in winter. They run $250 to $500 per window opening and $400 to $800 per patio door installed, and they last 15 years or more with normal use.

How do I order a replacement screen from my window manufacturer?

Find the window serial number on the spacer bar between the glass panes (look for a sticker or laser etching). Contact the manufacturer directly with the serial, the screen frame opening dimensions, and a photo of the existing screen. Lead time is usually 1 to 2 weeks at $45 to $90 per screen.

Talk to ALDA about your windows and doors

ALDA Windows and Doors has been replacing windows and doors across Toronto and the Greater Toronto Area since the early 2000s. Free in-home assessments, transparent quotes, and a permanent crew that does the installs themselves rather than subcontracting.

Request a free estimate or call us to book a no-pressure consultation.

Note: All prices provided in this article are approximate and may vary based on scope, materials and parts required- contact us for an accurate quote and diagnosis.

The post Window Screen Replacement: When to Repair vs Replace (Toronto 2026) appeared first on ALDA Windows and Doors.

After five months of freeze-thaw, road salt drift, and ice dams, every window in a Toronto home has taken a small beating. Spring is the right time to walk the perimeter, find the damage early, and decide what gets a tube of caulking versus what gets a quote for replacement. If you are already weighing a full upgrade, our vinyl window replacement service can give you a free in-home assessment, but most spring problems start with a 20-minute inspection you can do yourself.

This checklist walks you through the 12 things to look for, in roughly the order a professional installer would check them. None of it requires tools more sophisticated than a flashlight, a credit card, and a sheet of paper. By the end you will know which windows are still healthy, which ones need a small repair, and which ones are quietly costing you money on every Enbridge bill.

Why spring is the right time to inspect

Seal failures and frame movement that happen during winter are easiest to detect when the temperature gap between inside and outside is still meaningful but the snow and ice are gone. By late April you can see the bottom of the sill, the brick mould, and the caulking joints clearly. Wait until July and the wood will have dried out, hairline cracks will close, and you will miss problems that come back next winter.

There is also a practical reason. Most reputable GTA window companies are booked four to eight weeks out by mid-summer. Catching a problem in April and getting on the schedule means installation in May or June, before the busy fall rush.

1 to 3: the visual sweep

Start outside on a dry day. Walk the full perimeter of the house and look at each window from about three metres back, then close up.

1. Check for fogging between the panes. A failed insulated glass unit (IGU) shows up as a permanent haze, water droplets, or a milky film between the two panes of glass. Wiping the window does nothing because the moisture is sealed inside. A failed IGU has lost its argon fill and its insulating value is roughly cut in half. The glass unit can usually be replaced without replacing the whole window if the frame is healthy.

2. Look at the exterior caulking joints. Pay attention to the joint between the brick mould and the brick or siding, and the joint between the brick mould and the window frame itself. Cracks wider than the edge of a credit card, missing chunks, or caulking that has pulled away from one side are all failures. This is the single most common GTA problem because winter movement and UV exposure both attack the joint.

3. Inspect the brick mould or wood casing. Soft spots, paint that flakes in sheets, or visible black staining usually mean rot. Push a screwdriver gently into the bottom corners of any wooden trim the wood should resist firmly. Rot in the brick mould often hides bigger rot in the framing behind it.

4 to 6: the operating test

4. Open and close every operable window. Sliders that bind, casements that stick, and double-hungs that will not stay up are all signs that the frame has shifted or that hardware has failed. A casement crank that feels gritty or skips teeth is a $40 part you can swap, not a window replacement.

5. Test the lock. The lock is what pulls the sash tight against the weatherstripping. If it engages without resistance, the seal is loose. If you have to bang the sash to get the lock to seat, the frame is out of square. Both reduce thermal performance and security.

6. Check the weatherstripping. Open the sash and run a finger along the weatherstrip on all four sides. It should feel pliable and spring back when you press it. Hard, cracked, or compressed weatherstrip lets cold air leak past even when the lock is engaged. Replacement strip is sold by the foot at any home centre.

7 to 9: the leak test

7. The dollar-bill test. Close and lock the window with a sheet of paper or a dollar bill trapped between the sash and the frame. Tug the bill. If it slides out with no resistance, the weatherstripping is gone or the sash is not pulling tight. Repeat at the top, bottom, and both sides. A healthy window grips the bill firmly.

8. The candle test. On a still day, light a tea candle and slowly move it around the perimeter of each window from the inside. A flickering flame shows where air is moving. A flame that gets pulled hard in one direction is a major leak. Be careful with curtains.

9. Check the interior trim for staining. Brown or yellow staining on the interior wood or drywall under a window almost always means water has been getting in. The leak may be in the caulking, the head flashing, or the wall above the window. This is the most expensive class of problem and the one most likely to need professional attention.

10 to 12: the inside finish

10. Look for condensation patterns. Light fogging on the inside of the glass on a cold morning is normal humidity. Condensation that pools on the sill, runs down the frame, or creates ice along the bottom edge means the U-value is no longer adequate or the home is too humid for the glazing package installed.

11. Check the screen frames. Bent screen frames, torn mesh, or frames that no longer sit flush in the track are easy fixes but a screen that has been missing for a season usually means the inside of the track is dirty or rusted. Clean it now or the slider will get worse.

12. Make a list and prioritise. Group findings into three buckets. Bucket A: cosmetic, do it yourself this weekend (caulking, weatherstripping, hardware swap). Bucket B: get a quote (one or two failed IGUs, a single rotten brick mould). Bucket C: replacement candidate (multiple failures on the same window, structural rot, frame out of square). Bucket C windows are usually the ones quietly burning the most energy.

When to repair versus replace

A general rule used by GTA installers: if more than three of the twelve checks fail on a single window, replacement is usually cheaper over a five-year horizon than chasing repairs. A single IGU swap on a healthy frame runs $250 to $450. A full vinyl window replacement runs $750 to $1,800 for a standard size including installation, brick mould, and disposal of the old unit.

The exception is heritage homes in places like Cabbagetown, the Annex, or older parts of Mississauga’s Port Credit, where original wood windows may have heritage value or be subject to district guidelines. In those cases, restoration of the existing sash with new weatherstripping and a storm window can outperform a vinyl retrofit and preserve resale value.

2026 rebate programs to know

Two programs apply to most GTA homeowners replacing windows in 2026. The Enbridge Home Efficiency Rebate Plus (HER+) offers up to $400 per window when paired with other envelope upgrades and a qualifying ENERGY STAR Most Efficient rating. The Greener Homes Loan from Natural Resources Canada is still open for interest-free financing of up to $40,000 for envelope work including window replacement.

Both programs require an EnerGuide pre and post evaluation by a registered energy advisor before work begins. If you think replacement is on the table, book the pre-evaluation in April or May so the rebate paperwork is in place before installation.

Ontario homeowners may also qualify for the Ontario Home Renovation Savings Program, which offers additional support for energy-efficient upgrades including window replacement. Check the provincial program page for current eligibility and amounts.

Frequently asked questions

How long should an insulated glass unit last in Toronto?

A quality argon-filled IGU installed in a vinyl frame should hold its seal for 15 to 25 years. Cheaper units, south-facing windows that get heavy UV, and units installed under aluminum capping that traps heat tend to fail earlier often around year 10 to 12.

Can I replace just the glass instead of the whole window?

Yes, in most cases. If the frame, hardware, and weatherstripping are still healthy and only the IGU has failed, a glass-only replacement is roughly one-third the cost of a full window replacement and can be done in a single visit by most installers.

Is condensation on the inside of my windows a problem?

Light condensation on cold mornings is normal. Heavy condensation that pools on the sill or freezes is a sign your home is too humid for the U-value of the glass, or the glass is no longer performing. Run a hygrometer for a week — interior humidity in winter should sit between 30 and 40 percent in Toronto.

How much does a full window inspection cost from a professional?

Most reputable GTA window companies, ALDA included, offer free in-home assessments for homeowners considering replacement. A pure inspection from a building inspector or energy advisor runs $200 to $500 depending on the number of windows and whether a blower-door test is included.

Should I caulk my windows every spring?

Not every spring, but every three to four years is reasonable for exterior caulking joints, more often if the joints face south or are exposed to driving rain. Use a high-quality polyurethane or silicone-blend sealant rated for exterior masonry, not painter’s caulk.

Talk to ALDA about your windows and doors

ALDA Windows and Doors has been replacing windows and doors across Toronto and the GTA since the early 2000s. Free in-home assessments, transparent quotes, and a permanent crew that does the installs themselves rather than subcontracting.

Request a free estimate or call us to book a no-pressure consultation.

The post Spring Window Inspection Checklist for Toronto Homeowners (2026) appeared first on ALDA Windows and Doors.